A transducer is a device which converts a signal from one form to another. Most electronics circuits use both input and output transducers:
- LDR converts brightness (of light) to resistance.
- Thermistor converts temperature to resistance.
- Microphone converts sound to voltage.
- Variable resistor converts position (angle) to resistance.
- Lamp converts electricity to light.
- LED converts electricity to light.
- Loudspeaker converts electricity to sound.
- Motor converts electricity to motion.
- Heater converts electricity to heat.
Using input transducers (sensors)
|Voltage divider circuit|
The voltage signal can be fed to other parts of the circuit, such as the input to an IC or a transistor switch.
The conversion of varying resistance to varying voltage is performed by a simple circuit called a voltage divider.
Please see the next page for more information about voltage dividers.